EP2664484B1 - Traveling range calculation apparatus, method and program - Google Patents

Traveling range calculation apparatus, method and program Download PDF

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Publication number
EP2664484B1
EP2664484B1 EP13153165.9A EP13153165A EP2664484B1 EP 2664484 B1 EP2664484 B1 EP 2664484B1 EP 13153165 A EP13153165 A EP 13153165A EP 2664484 B1 EP2664484 B1 EP 2664484B1
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Prior art keywords
energy
road
integration value
traveling range
range
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German (de)
English (en)
French (fr)
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EP2664484A3 (en
EP2664484A2 (en
Inventor
Yuichi Kobayashi
Keisuke Shirai
Masamori Kashiyama
Tatsuaki Osafune
Kazuhide Nishiyama
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Hitachi Ltd
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Hitachi Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the disclosed subject matter relates to technology for calculating a range of a vehicle that travels by using stored energy.
  • Electric-powered vehicles also called moving vehicles
  • traveling range the range an electric-powered vehicle can achieve without recharging
  • technology for calculating the traveling range of an electric-powered vehicle and displaying the results thereof on a map is needed.
  • Patent Literature 1 Japanese Patent Application Laid-open No. 2009-025128
  • a technology is provided that allows accurate calculation of a traveling range within which it is possible to return to a point of departure without replenishing energy along the way.
  • a traveling range calculation apparatus is for computing a range of a vehicle that travels by using stored energy, and comprises a storage part, which stores beforehand as an energy consumption graph an amount of energy consumed by a vehicle traveling in both directions along road links on a map rendered in a manner that road links couple road nodes, and a processing part, which traces a road link from a specified start point location peripherally, calculates, for each road node, a first integration value obtained by integrating the amount of energy in the direction moving away from the above-mentioned start point location in the above-mentioned energy consumption graph, and a second integration value obtained by integrating the amount of energy in the direction approaching the above-mentioned start point location in the above-mentioned energy consumption graph, and based on a relationship between the sum of the above-mentioned first integration value and the above-mentioned second integration value, and a given specified amount of energy for each road node, decides a round-trip traveling range which is a range within which the above
  • Patent Literature 2 a travel guidance system for a vehicle having a plurality of on-onboard batteries notifies the driver of the charging facility that makes it possible to complete round-trip travel from the charging facility to a destination and back to the charging facility with one of the on-board batteries, which is not left at the charging facility as a power supply source.
  • Patent Literature 3 a navigation apparatus, a vehicle information display apparatus, and vehicle information display system which allow a user to find out the reachable range of an electric vehicle even when not on board of the electric vehicle.
  • Patent Literature 4 a navigation apparatus renders possible to display in an easy and understandable manner to a user a minimum charge time required to travel to a destination.
  • Fig. 1 shows a block diagram of a telematics system in accordance with a first embodiment.
  • the telematics system of the present embodiment comprises a server 10 and user information terminals 20, and the configuration is such that the server 10 and the user information terminals 20 are able to communicate via a network 50.
  • the user information terminal 20 is a car navigation apparatus mounted in an electric vehicle, which travels by using energy stored in an electrical storage apparatus.
  • the car navigation apparatus is one example of a user information terminal 20, but this terminal 20 may be another communication apparatus capable of being coupled to a network, such as a personal computer, a smartphone, and a tablet terminal.
  • the server 10 comprises functions for calculating a range capable of being traveled by each electric vehicle (hereinafter referred to as "traveling range").
  • Fig. 2 is a block diagram representing the basic functions of the server 10 according to the first embodiment.
  • Fig. 3 is a block diagram representing the basic functions of the user information terminal 20 according to the first embodiment.
  • the server 10 comprises a storage part 11, a processing part 12, and a communication part 13.
  • the storage part 11 stores a digital map 31 and an energy consumption graph 32 beforehand, and stores traveling range data 33 showing a traveling range calculated by the processing part 12.
  • the digital map 31 is map data expressed by using the road links to couple road nodes, and includes road shape and gradient information, and, in addition, associates traffic information for each road link.
  • the energy consumption graph 32 shows the amount of energy consumed by a vehicle traveling in both directions along the road links on the digital map 31.
  • the processing part 12 calculates a range (hereinafter referred to as "round-trip traveling range") within which an electric vehicle is capable of traveling by using a given specified amount of energy by traveling so as to trace road links toward the perimeter from a specified start point location and once again returning to the start point location, and records this range in the storage part 11 as traveling range data 33.
  • the start point location is not limited in any particular way, and, for example, may be a location specified by a user input, or may be a current location acquired via a GPS (Global Positioning System) mounted in the electric vehicle.
  • GPS Global Positioning System
  • the specified amount of energy is also not limited in any particular way, and, for example, may be a value specified by a user input, may be the actual remaining capacity of the electrical storage apparatus mounted in the electric vehicle, or may be an amount of electricity stored when the electrical storage apparatus of the electric vehicle is fully charged.
  • round-trip travel does not refer only to a case where the same road link is traveled both going and returning, but rather also includes a case where different road links are travelled going and returning.
  • first of all the processing part 12 calculates a first integration value obtained by tracing a road link from a start point location peripherally and integrating the amount of energy consumed in the direction (hereinafter referred to as "forward direction") going away from the start point location in the energy consumption graph of the storage part 11 for each road node, and a second integration value obtained by integrating the amount of energy consumed in the direction (hereinafter referred to as "reverse direction”) approaching the start point location in the energy consumption graph.
  • forward direction a first integration value obtained by tracing a road link from a start point location peripherally and integrating the amount of energy consumed in the direction
  • reverse direction a second integration value obtained by integrating the amount of energy consumed in the direction
  • the processing part 12 may perform a Dijkstra algorithm route search.
  • search conditions can be set at this time. For example, in a case where a route search is performed by using time as a priority, the route search may be performed so as to minimize the required time as a score. In a case where distance is a priority, the distance may be used as the score, and in a case where energy consumption is a priority, the energy consumption may be used as the score.
  • the processing part 12 may trace the road links by configuring different search conditions using a forward direction route search and a reverse direction route search. For example, the setting can be such that going has time as a priority and returning has energy consumption as a priority.
  • the communication part 3 communicates with the user information terminal 20 by way of the network 50.
  • Information may be communicated from the user information terminal 20 to the server 10, for example, information such as the current location of the electric vehicle in which the user information terminal 20 is mounted, and the current remaining electrical storage capacity of the electrical storage apparatus.
  • Information may also be communicated from the server 10 to the user information terminal 20, for example, information on the electric vehicle traveling range calculated by the processing part 12.
  • the user information terminal 20 comprises a communication part 21 and a display part 22.
  • the communication part 21 communicates with the server 10 via wireless communications with the network 50.
  • the communication part 21 for example, communicates information, such as the current location of the electric vehicle in which the user information terminal 20 is mounted and the current remaining electrical storage capacity of the electrical storage apparatus to the server 10, and, for example, communicates information on the electric vehicle traveling range calculated by the processing part 12 to the server 10.
  • the display part 22 displays information to be presented to the user via an image and text.
  • the user information terminal 20 in addition to the communication part 21 and the display part 22, may comprise an input part for receiving a user input, a location detection part for acquiring a current location, and a remaining battery amount detection part for detecting the remaining electrical storage capacity of the electrical storage apparatus mounted in the electric vehicle.
  • the processing of the processing part 12 will be explained more specifically.
  • the processing part 12 traces road links toward the perimeter from a start point location, and performs the calculation of the first integration value up to a road node where the first integration value becomes equal to or larger than a specified amount of energy.
  • the processing part 12 once again traces road links peripherally from the start point location, and this time performs the calculation of the second integration value up to the road node for which the first integration value was calculated.
  • the processing part 12 calculates the total value of the first integration value and the second integration value for the road node for which the first integration value and the second integration value were calculated, and regards the range of the road node for which this total value is equal to or less than a specified amount of energy as the round-trip traveling range.
  • the processing part 12 additionally calculates a one-way traveling range, which is the traveling range that the electric vehicle can reach by using the specified amount of energy. At this time, the processing part 12 first selects all the road nodes for which the first integration value matches the specified amount of energy, or the road nodes immediately before the road nodes for which the first integration value exceeds the specified amount of energy. Next, the processing part 12 decides the range from the start point location up to the selected road node as the one-way traveling range. The process by which the processing part 12 calculates the first integration value is used for both the one-way traveling range calculation and the round-trip traveling range calculation, and the processing is executed efficiently overall.
  • Fig. 5 is a flowchart showing the processing of the server 10 in the first embodiment. The processing of the server 10 shown here is executed by the processing part 12.
  • the server 10 creates an energy consumption graph 32 beforehand and stores this graph 32 in the storage part 11 (Step 101), and thereafter, calculates the traveling range of the electric vehicle in accordance with a request (Step 102).
  • the processing part 12 calculates the energy consumption when the electric vehicle is traveling in both directions along the road links based on the distances and elevation differences of the digital map 31, and records this energy consumption in the energy consumption graph 32.
  • the energy consumption increases in accordance with the distance, and the energy consumption for each distance increases in the case of an uphill gradient and decreases in the case of a downhill gradient.
  • Fig. 6 is a flowchart showing the detailed processing of Step 102.
  • the server 10 traces the road links toward the perimeter from the start point location, calculates the energy consumption in the forward direction, and calculates a first integration value to each road node (Step 201).
  • the individual processes will be explained in detail further below.
  • the server 10 likewise traces the road links peripherally from the start point location, calculates the energy consumption in the reverse direction, and calculates a second integration value to each road node (Step 202). This processing will also be explained in detail further below.
  • the server 10 decides the round-trip traveling range and the one-way traveling range based on the first integration value and the second integration value (Step 203). At this time, the server 10 calculates the total value of the first integration value and the second integration value for each road node, and regards the range of the road node for which the total value is equal to or less than the specified amount of energy as the round-trip traveling range. Furthermore, the server 10 regards the range of the road node for which the first integration value is equal to or less than the specified amount of energy as the one-way traveling range.
  • Fig. 7 is a flowchart showing the processing of Step 201 in detail.
  • the server 10 configures an initial condition for calculating the first integration value (Step 301).
  • the initial condition includes a start point location, which shows the location from which a search begins, and a search condition, such as whether priority is to be placed on distance or time.
  • a search condition such as whether priority is to be placed on distance or time.
  • the road node closest to a specified location may be used as the start point location.
  • the server 10 executes the Dijkstra algorithm on the basis of the search condition from the current road node, and advances to the next road node (Step 302), and adds to the first integration value the energy consumption in a case where the electric vehicle travels in the forward direction with respect to the road link that was taken, that is, the direction moving away from the start point location (Step 303).
  • the server 10 determines whether or not the first integration value is equal to or larger than the specified amount of energy (Step 304). When the first integration value does not satisfy the specified amount of energy, the server 10 returns to Step 302 and repeats the Dijkstra algorithm. When the first integration value is equal to or larger than the specified amount of energy, the server 10 ends the integration process, and finalizes the road node for which integration has been completed (Step 305).
  • Fig. 8 is a flowchart showing the processing of Step 202 in detail.
  • the server 10 configures an initial condition for calculating the second integration value (Step 401).
  • the initial condition includes a start point location and a search condition.
  • the start point location is the same location as when the first integration value was calculated, but the search condition does not necessarily have to be the same as when the first integration value was calculated.
  • the server 10 executes the Dijkstra algorithm on the basis of the search condition from the current road node, and advances to the next road node (Step 402), and adds to the second integration value the energy consumption in a case where the electric vehicle travels in the reverse direction with respect to the road link that was taken, that is, the direction approaching the start point location (Step 403).
  • the server 10 determines whether or not processing has reached the integration-complete road node, which was finalized in Step 305 (Step 404). In a case where the processing has not reached the integration-complete road node, the server 10 returns to Step 402 and repeats the Dijkstra algorithm. In a case where the processing has reached the integration-complete road node, the server 10 ends the processing.
  • Fig. 9 is a block diagram of a telematics system according to a second embodiment.
  • the telematics system of this embodiment comprises a server 10 and the user information terminal 20, and the configuration is such that the server 10 and the user information terminal 20 can communicate via the network 50 the same as the first embodiment.
  • the user information terminal 20 comprises a communication part 21, a display part 22, a location detection part 23, a remaining battery amount detection part 24, and an input part 25, and is mounted in an electric vehicle, which travels by using energy stored in an electrical storage apparatus.
  • the server 10 is basically configured the same as that of the first embodiment, and comprises a storage part 11 and a processing part 12.
  • the storage part 11 stores a digital map 31, an energy consumption graph 32, and traveling range data 33 the same as in Fig. 4 .
  • the processing part 12 comprises an energy consumption graph creation part 41 and a traveling range calculation part 42.
  • the energy consumption graph creation part 41 executes the processing of Step 101 shown in Fig. 5
  • the traveling range calculation part 42 executes the processing of Step 102.
  • Step 102 information on the current location of each electric vehicle and the remaining battery amount of the electrical storage apparatus is acquired from the user information terminal 20, and based on this information, a round-trip traveling range and a one-way traveling range is calculated for each electric vehicle.
  • the method for calculating the round-trip traveling range and the one-way traveling range is basically the same as the method of the first embodiment.
  • Fig. 10 is a drawing for explaining an example of a traveling range calculation.
  • a map of the area surrounding the current location of the electric vehicle is depicted in Fig. 10 .
  • the location indicated by a mark in which a black triangle is depicted inside a circle is the current location of the electric vehicle.
  • the current location becomes the start point location in a traveling range calculation.
  • a black dot mark represents a road node, and a solid line coupling road nodes represents a road link.
  • a link ID is shown for a road link coupled to the start point location road node.
  • the link ID is an identifier for uniquely identifying each road link.
  • the alphabet letters in the drawing are the node IDs of the respective road nodes.
  • the numerals appended with a # sign in the drawing are the link IDs of the respective road links.
  • the numerals written on both sides of a road link are the amounts of energy consumed by traveling along this road link.
  • the unit used for energy consumption is kWh.
  • a non-underlined numeral is the energy consumption in the forward direction, and an underlined numeral is the energy consumption in the reverse direction.
  • Fig. 11 is a table showing map information for the road links of link IDs 1 through 6 shown in Fig. 10 . This map information is included in the digital map 31.
  • the map information includes a distance, that is, a road length, times required to travel in the forward direction and the reverse direction, and an elevation difference based on the forward direction.
  • Fig. 12 is a table showing an energy consumption graph 32 for the road links of the link IDs 1 through 6 shown in Fig. 10 .
  • the amount of energy consumed by traveling in the forward direction, and the amount of energy consumed by traveling in the reverse direction are described for each road link in the energy consumption graph 32.
  • the same as in the case of Fig. 11 in an actual energy consumption graph 32, it is assumed that the amount of energy consumed will be described with respect to the outbound direction and the inbound direction rather than the forward direction and the reverse direction.
  • a road link for which the elevation difference in the forward direction is a positive value indicates that the electric vehicle is traveling uphill, and as such, the amount of energy consumed in the forward direction will be a larger value than the amount of energy consumed by traveling in the reverse direction.
  • a road link for which the elevation difference in the forward direction is a negative value is the opposite thereof.
  • the server 10 traces road links from the road node S of the start point location, and integrates the amount of energy consumed in the forward direction. For example, upon tracing the road links from the road node S to road node A and then to road node AB, the integration value (first integration value) of the energy consumption in the forward direction is 24 kWh, which is equivalent to the specified amount of energy. Thus, the server 10 ends the integration of the first integration value for this route at the road node AB. Similarly, for example, upon tracing the road links from the road node S to the road node A and then on to road node AA, the first integration value is 24 kWh, and as such, the server 10 ends the integration of the first integration value for this route at the road node AA.
  • the integration of the first integration value has been performed for all directions surrounding the start point location
  • the integration of the first integration values for the respective routes with respect to the road nodes AB, AA, BA, CA, DA, DB, EA, and FA ends.
  • the range from the start point location to the road nodes AB, AA, BA, CA, DA, DB, EA, and FA becomes the one-way traveling range.
  • the server 10 once again traces the road links from the road node S at the start point location up to the road node for which the integration of the first integration value has been completed, and this time integrates the amount of energy consumed in the reverse direction to calculate a second integration value to each road node.
  • the server 10 calculates a total value of the first integration value and the second integration value for each road node for which the first integration value and the second integration value has been calculated, and selects a road node for which the total value is equal to or less than the specified amount of energy of 24 kWh.
  • the total value is 24 kWh.
  • the server 10 regards the range from the road node S at the start point location to these selected road nodes A, B, C, D, E, and F as the round-trip traveling range.
  • Fig. 13 is a table showing traveling range data for a round-trip traveling range. Referring to Fig. 13 , first integration values and second integration values are shown for road nodes A, B, C, D, E, and F, and a round-trip amount of energy, which is the total value thereof, is shown.
  • the server 10 distinguishes between the road nodes within the round-trip traveling range as being a first round-trippable road node for which the first integration value is larger than one half of the specified amount of energy, and a second round-trippable road node for which the first integration value is equal to or less than one half of the specified amount of energy.
  • the road nodes A, B and F are the first round-trippable road nodes
  • the road nodes C, D, and E are the second round-trippable road nodes.
  • the server 10 adds an over flag to the first round-trippable road nodes. Referring to Fig.
  • an over flag is added to the first round-trippable road nodes A, B, and F. This makes it possible to present the user with information as to whether or not the amount of energy consumed in order to travel that far is more than one half of the specified amount of energy (for example, the remaining electrical storage capacity at the time of departure) for each road node for which round-trip travel is possible.
  • the storage part 11 also stores in the digital map 31 a location on the map where there exists a charging facility at which the electric vehicle can be charged, and the processing part 12 determines, for each outermost road node in the round-trip traveling range, whether or not there is a charging facility within a predetermined distance from this road node. Then, the server 10 adds a charging POI flag to a road node for which there is a charging facility (charging POI) within the predetermined distance. Referring to Fig. 13 , a charging POI flag is added to road nodes C and F. This makes it possible to present the user with information as to whether or not there is a charging facility in the outermost vicinity of the range within which round-trip travel is possible.
  • Fig. 14 is a drawing showing an example of a display of traveling ranges.
  • the traveling ranges are superposably displayed on the map shown in Fig. 10 .
  • the range enclosed within the dashed line is the round-trip traveling range, and the range enclosed within the dotted line is the one-way traveling range.
  • a percentage of the specified amount of energy estimated to be the remaining battery amount upon reaching a road node and a remaining capacity value are displayed in the vicinity of the road nodes for which the first integration value is larger than one half of the specified amount of energy from among the road nodes within the round-trip traveling range.
  • Charging facility displays are displayed in the vicinity of the road nodes C and F, where charging facilities exist within a predetermined distance of the road nodes at the outer edge of the round-trip traveling range.
  • the server 10 calculates a traveling range and notifies the user information terminal 20, and the user information terminal 20 displays the traveling range.
  • a personal computer, a car navigation apparatus, a smart phone or other such user information terminal itself may calculate and display the traveling range.
  • An example in which a car navigation apparatus calculates and displays a traveling range on its own is shown as a third embodiment.
  • Fig. 15 is a block diagram of a car navigation apparatus according to the third embodiment. This embodiment is such that, rather than a server calculating the traveling range as in the first and second embodiments, a car navigation apparatus mounted in the electric vehicle calculates the traveling range.
  • the car navigation apparatus 60 calculates the traveling range on its own based on a current location and a remaining electrical storage capacity, which it has acquired on its own.
  • the car navigation apparatus 60 comprises a storage part 11, a processing part 12, a display part 22, a location detection part 23, a remaining battery amount detection part 24, and an input part 25.
  • the storage part 11, the processing part 12, the display part 22, the location detection part 23, the remaining battery amount detection part 24, and the input part 25 are the same as those shown in Fig. 9 .
  • the server 10 or the car navigation apparatus 60 of the respective embodiments described hereinabove can also be realized in accordance with having a computer execute a software program, which specifies the processing steps performed by the processing part 12.

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EP13153165.9A 2012-03-08 2013-01-30 Traveling range calculation apparatus, method and program Active EP2664484B1 (en)

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EP2664484A3 (en) 2017-10-18
JP2013185977A (ja) 2013-09-19
CN103308049B (zh) 2016-09-28
EP2664484A2 (en) 2013-11-20
CN103308049A (zh) 2013-09-18
US20130238162A1 (en) 2013-09-12
JP5787797B2 (ja) 2015-09-30

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